US2987888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic master drive unit
Assignee: CROWELL DESIGNS Inc
•
Filing: 1959-11-23
•
Granted: 1961-06-13
•
Expires: 1979-11-23
Abstract
No abstract record available.
Inventors
- 👤 Gordon W Crowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:35
CPC Classifications
F; F15; F15B; F15B7/00; F15B7/06; F15B7/08; F15B7/001; F15B7/005; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19744; Y10T74/19749
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1894055A
Cited
DE612012C
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FR829314A
Cited
US2204649A
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US2267524A
Cited
US2287960A
Cited
US2374672A
Cited
US2471619A
Cited
US2688260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |